Finding the Fourth Proportional to 12,959.79, 19,430.56 and 5,056.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,959.79 : 19,430.56 = 5,056.21 : x
2. Step 2: Convert to fraction form
   12,959.79/19,430.56 = 5,056.21/x
3. Step 3: Cross multiply
   12,959.79x = 19,430.56 × 5,056.21
4. Step 4: Simplify right side
   12,959.79x = 98,244,991.78
5. Step 5: Solve for x
   x = 98,244,991.78/12,959.79
6. Step 6: Final answer
   x = 7,580.75